JP7188069B2 - Engine seal structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine seal structure, for example, in which a gap between a cover member covering a timing chain and an engine body is closed with a liquid sealant.

Recently, some engines using gasoline or light oil as fuel have a mechanism for injecting lubricating oil to the timing chain in order to reduce the sliding resistance of the timing chain. In the case of an engine equipped with such a mechanism for injecting lubricating oil, the timing chain provided in the engine body is covered with a cover member, and by closing the gap between the engine body and the cover member, the lubricating oil is released to the outside. leakage is prevented.

For example, Patent Document 1 discloses an engine body that rotatably supports a timing chain, a timing chain cover that is fastened and fixed to the engine body so as to cover the timing chain, and a timing chain cover that faces the engine body. An engine seal structure is disclosed which includes a fitted elastic seal member and closes a gap between an engine main body and a timing chain cover by the elasticity of the seal member.

By the way, as a means for closing the gap between the engine body and the cover member, there is a liquid sealing agent interposed between the engine body and the cover member, in addition to the elastic sealing member as in Patent Document 1.

This liquid sealant is applied to the mating surface of the engine body or the mating surface of the cover member in a line. By being widened, it closes the gap between the engine body and the cover member.

However, when the liquid sealant is spread thinly, it is difficult to control the flow of the liquid sealant.
For example, when a liquid sealant is applied near an insertion hole that penetrates the mating surfaces of the engine body and the cover member, the thinly spread liquid sealant not only flows into the insertion hole, There is a problem that the liquid sealant adheres to the inside of the insertion hole.

In particular, when the fastening member is inserted through the insertion hole as an insertion member in a process after the engine body and the cover member are fastened and fixed, the liquid sealant adhered to the insertion hole hinders the insertion of the fastening member. I was afraid.

JP 2015-121145 A

In view of the above-described problems, the present invention prevents the insertion of the insertion member through the insertion hole even when the insertion member is inserted through the insertion hole in a process after the engine body and the cover member are fastened and fixed. An object of the present invention is to provide an engine seal structure that can be easily manufactured.

The present invention comprises an engine body having a mating surface at one end in a predetermined direction, and a cover member having a mating surface corresponding to the mating surface of the engine body and fastened and fixed to the engine body to form an internal hollow space. , the mating surfaces of the engine body, and a liquid sealant interposed between the mating surfaces of the cover member, wherein the engine includes the mating surfaces of the engine body, and A plurality of insertion holes that pass through the mating surface of the cover member in a predetermined direction and through which insertion members are inserted are provided, and the inner hollow space side of the mating surface of the engine body or the mating surface of the cover member is provided with a plurality of insertion holes. A portion along the edge is provided with a seal application area to which the liquid sealant is applied , and the plurality of insertion holes are formed in the first insertion hole and the second insertion hole provided along the seal application area. As the insertion hole, a fastening member for fastening and fixing the cover member to the engine body is inserted through the first insertion hole as the insertion member, and the second insertion hole sandwiches the cover member. The mating surface of the cover member, which communicates with the opening hole of the fastened part fixed to the engine body, has the inner portion corresponding to the portion between the second insertion hole and the seal application area. A groove extending along the edge on the hollow space side and recessed in a substantially groove shape, and a recess having a larger volume than the volume of the groove and continuing to one end of the groove are provided , A concave portion is provided between the first through-hole and the second through-hole adjacent to each other along the seal application region .

Further, the present invention provides an engine body having a mating surface at one end in a predetermined direction, and a cover member having a mating surface corresponding to the mating surface of the engine body and fastened and fixed to the engine body to form an internal hollow space. and a liquid sealant interposed between the mating surfaces of the engine body and the mating surfaces of the cover member, wherein the engine includes the mating surfaces of the engine body, and a plurality of insertion holes through which insertion members are inserted through the mating surface of the cover member in a predetermined direction, the inner hollow space side of the mating surface of the engine body or the mating surface of the cover member. A seal application region to which the liquid sealant is applied is provided in a portion along the edge of the seal application region, and the plurality of insertion holes are provided along the seal application region. A fastening member for fastening and fixing the cover member to the engine body is inserted through the first insertion hole as the insertion hole, and the second insertion hole sandwiches the cover member. communicates with an opening hole of a fastened part fixed to the engine body, and the mating surface of the cover member has a portion corresponding to between the second insertion hole and the seal application area, the interior A groove extending along the edge on the hollow space side and recessed in a substantially groove shape, and a recess having a larger volume than the volume of the groove and continuing to one end of the groove are provided, A concave portion is provided at a position adjacent to the second through-hole along the seal application region, with the first through-hole adjacent to the second through-hole interposed therebetween.

The internal hollow space is a space that can accommodate, for example, a timing chain, parts attached to the engine, and the like.
The above-mentioned insertion member means, for example, a fastening member such as a bolt, and a positioning member such as a knock pin or a substantially cylindrical collar member.
The first insertion hole and the second insertion hole are an opening formed in the engine body and an opening formed in the cover member in a state in which the mating surfaces face each other with the liquid sealing agent interposed therebetween. are connected.

According to the present invention, the engine seal structure can be provided with a recessed groove on the path of the mating surface from the seal application area to the second insertion hole. Therefore, for example, when the liquid sealant applied to the seal application area of one mating surface is spread thinly by pressure from the other mating surface, the seal structure of the engine is directed toward the second insertion hole. The liquid sealing agent flowing through the groove can be made to flow into the groove.

As a result, the engine sealing structure can control the flow of the liquid sealing agent that accompanies the fastening and fixing between the engine body and the cover member, and can prevent the liquid sealing agent from flowing into the second insertion hole. That is, the seal structure of the engine can prevent the insertion of the insertion member into the second insertion hole from being hindered by the liquid sealing agent.
Therefore, even if the insertion member is inserted through the second insertion hole in a process after the engine main body and the cover member are fastened and fixed, the seal structure of the engine does not allow the insertion through the second insertion hole. It is possible to facilitate insertion of the member.

In addition, in the present invention, the mating surface of the cover member is provided with a recess that is recessed so as to be adjacent to and continuous with the groove, and the recess has a larger volume than the groove. It is characterized by being recessed with a volume.

According to the present invention, the seal structure of the engine can improve the sealing performance between the mating surfaces of the engine body and the mating surfaces of the cover member, and reliably prevent the liquid sealing agent from flowing into the second insertion hole. can be done.

Specifically, when the liquid sealing agent starts to flow into the groove, the air in the groove is compressed by the inflowing liquid sealing agent. For this reason, the smaller the volume of the groove, that is, the smaller the amount of air compression up to the compression limit, the more the liquid sealant does not smoothly flow into the groove. There was a risk of being pushed out of the

Therefore, by providing a recess having a larger volume than the volume of the groove continuously with the groove, the seal structure of the engine is such that the liquid sealant can push out the air in the groove to the recess, so the compression limit is reduced. It is possible to increase the amount of air compression up to the point in comparison with the case where the recess is not provided.

As a result, the sealing structure of the engine prevents the liquid sealing agent that has flowed into the groove from being pushed out of the groove by the compressed air in the groove, and allows the liquid sealing agent to smoothly flow into the groove. .

Furthermore, since the pressurization of the liquid sealant by the compressed air in the groove is suppressed, the seal structure of the engine allows the liquid sealant to flow smoothly between the mating surfaces of the engine body and the cover member. , can be spread more evenly and thinly.
Therefore, the sealing structure of the engine can improve the sealing performance between the mating surface of the engine body and the mating surface of the cover member, and can reliably prevent the liquid sealing agent from flowing into the second insertion hole. .

Further, as an aspect of the present invention, the groove portion is located between the second insertion hole and the seal application area so that the first insertion hole is located in a portion corresponding to the seal application area. , it may continue to the recess through between the first insertion hole and the second insertion hole.

Further, as an aspect of the present invention, in a cross-section along the radial direction of the second insertion hole, the groove has a cross-sectional area larger than the cross-sectional area of the liquid sealing agent applied to the mating surface. It may be recessed.
According to the present invention, the sealing structure of the engine can reliably store the liquid sealing agent that has started to flow into the groove in the groove, thereby preventing the liquid sealing agent from flowing out of the groove.

Therefore, the seal structure of the engine can more reliably prevent the liquid sealant from flowing into the second insertion hole.
Therefore, the seal structure of the engine can more reliably facilitate the insertion of the insertion member into the second insertion hole.

Further, as an aspect of the present invention, the to- be-fastened part is a transmission that is attached to the engine body with the cover member interposed therebetween, and the second insertion hole is the transmission through which the insertion member can be inserted. It may be configured to communicate with the opening hole of.
According to the present invention, in the seal structure of the engine, when the insertion member is inserted through the opening in which the second insertion hole of the engine communicates with the open hole of the transmission, the insertion of the insertion member is prevented by the liquid sealing agent. can be prevented.

For this reason, the seal structure of the engine prevents the insertion member from being inserted even when the transmission is attached to the engine via the insertion member, for example, after the engine body and the cover member are fastened and fixed. can be made easier .

According to the present invention, an engine seal capable of facilitating insertion of an insertion member into an insertion hole even when the insertion member is inserted into the insertion hole in a process after an engine body and a cover member are fastened and fixed. structure can be provided.

FIG. 2 is a plan view showing components of the vehicle in a plan view; The front view which shows the front view of an engine and a transmission. FIG. 2 is an exploded perspective view showing an exploded state of the engine as viewed from above the front of the vehicle; The side view which shows the side surface of the engine main body seen from the vehicle width direction left side. FIG. 2 is a side view showing the side surface of the chain cover viewed from the right side in the vehicle width direction; FIG. 5 is a cross-sectional view taken along the line AA. Explanatory drawing which demonstrates an insertion hole in a cross section. Explanatory drawing explaining the principal part of a chain cover.

An embodiment of the invention will be described below with reference to the drawings.
The vehicle 1 of the present embodiment is a front-wheel drive vehicle having, for example, a transverse engine 2 (hereinafter referred to as "engine 2") that uses gasoline or the like as fuel. A seal structure in the engine 2 of the vehicle 1 will be described in detail with reference to FIGS. 1 to 8. FIG.

1 shows a plan view of components of a vehicle 1, FIG. 2 shows a front view of an engine 2 and a transmission 3, and FIG. 4 shows a side view of the engine body 20 seen from the left side in the vehicle width direction, FIG. 5 shows a side view of the chain cover 40 seen from the right side in the vehicle width direction, and FIG. 7 shows an explanatory view for explaining the insertion hole 14 in cross section, and FIG. 8 shows an explanatory view for explaining the main part of the chain cover 40. As shown in FIG.

7A shows a cross-sectional view along the radial direction of the second through-hole 402, FIG. 7B shows a cross-sectional view along the radial direction of the third through-hole 403, and FIG. ) shows a side view of the vicinity of the second through hole 402 seen from the left side in the vehicle width direction, and FIG. 8B shows a side view of the vicinity of the third through hole 403 seen from the left side in the vehicle width direction.
In the drawings, arrows Fr and Rr indicate the front-rear direction, with arrow Fr indicating the front and arrow Rr indicating the rear. Furthermore, the arrows Rh and Lh indicate the vehicle width direction, the arrow Rh indicates the right direction, and the arrow Lh indicates the left direction.

First, as shown in FIG. 1, a vehicle 1 according to the present embodiment includes a transverse engine 2 and a transmission 3 connected to the left side of the engine 2 in the front part of the vehicle.
Furthermore, as shown in FIG. 1, the vehicle 1 has an exhaust manifold 4 through which exhaust gas discharged from the engine 2 flows down, and a first catalyst 5, which are connected in this order to the rear surface of the engine 2, and a second catalyst 6. , a pre-silencer 7 and a main silencer 8 are connected to the first catalyst 5 via an exhaust pipe 9 in this order from the front of the vehicle.

As shown in FIGS. 2 and 3, the engine 2 of such a vehicle 1 includes an engine body 20 having a crankshaft 21 for transmitting driving force to the transmission 3, and a left side face of the engine body 20 in the vehicle width direction. It is equipped with a chain cover 40 that is mounted and sandwiched between the engine body 20 and the transmission 3 .

As shown in FIG. 3, the engine body 20 and the chain cover 40 are fastened and fixed by a first fastening bolt 11 screwed into the engine body 20 via the chain cover 40 from the left side in the vehicle width direction. On the other hand, as shown in FIG. 3, the engine main body 20 and the transmission 3 are screwed into the engine main body 20 via the transmission 3 and the chain cover 40 from the vehicle width direction left, or the engine main body 20 is screwed from the vehicle width direction right. It is fastened and fixed by a second fastening bolt 12 screwed to the transmission 3 via the main body 20 and the chain cover 40 .

As shown in FIGS. 2 and 3, the engine body 20 includes an engine block 22 that rotatably supports a crankshaft 21 whose rotation axis is in the vehicle width direction, and a cylinder head 23 that is mounted on the upper surface of the engine block 22. , a head cover 24 attached to the upper surface of the cylinder head 23 and an oil pan 25 attached to the lower surface of the engine block 22 .

Specifically, as shown in FIGS. 2 and 3, the engine block 22 is composed of an upper block 26 that supports the crankshaft 21 from above the vehicle and a lower block 27 that supports the crankshaft 21 from below the vehicle. ing.
Although not shown in detail, the upper block 26 is shaped to have an internal space in which cylinder chambers arranged at predetermined intervals in the vehicle width direction communicate with a space capable of accommodating the crankshaft 21 . there is This upper block 26 is provided with a piston, a connecting rod, and the like.

Further, a fuel pump (not shown) for supplying fuel to the combustion chamber is disposed inside the upper block 26, and a fuel pump drive shaft 28 for driving the fuel pump (not shown) is rotatably supported. ing. As shown in FIG. 4, the fuel pump drive shaft 28 is a shaft having a rotation axis in the vehicle width direction, and is rotatably supported at a position above and in front of the vehicle relative to the crankshaft 21. .

On the other hand, the lower block 27 has therein an oil pump (not shown) for circulating engine oil as lubricating oil in the engine 2, and an oil pump drive shaft for driving the oil pump (not shown). 29 is rotatably supported. As shown in FIG. 4, the oil pump drive shaft 29 is a shaft body having a rotation axis in the vehicle width direction, and is rotatably supported at a position lower than the crankshaft 21 in the vehicle.

As shown in FIGS. 3 and 4, the engine block 22 configured as described above has a vehicle width direction left side surface extending from the upper end of the upper block 26 to the lower end of the lower block 27 on the front side of the vehicle. It is formed in a shape having a front edge portion 221 protruding leftward in the direction and a rear edge portion 222 protruding leftward in the vehicle width direction from the edge portion on the vehicle rear side from the upper end of the upper block 26 to the lower end of the lower block 27 . It is

In other words, the left side surface of the engine block 22 in the vehicle width direction is recessed rightward in the vehicle width direction, except for the front edge portion 221 and the rear edge portion 222 .
As shown in FIGS. 3 and 4, the front edge portion 221 of the engine block 22 has a substantially flat surface facing the chain cover 40, which will be described later, at the left end surface in the vehicle width direction. It is formed as an attached front mating surface 221a.
Similarly, the rear edge portion 222 of the engine block 22 has a substantially flat surface facing the chain cover 40 described later, and serves as a rear mating surface 222a on which the chain cover 40 is mounted. formed.

Further, as shown in FIGS. 3 and 4, the front mating surface 221a and the rear mating surface 222a of the engine block 22 are provided with a first joint for fastening and fixing the chain cover 40 in a side view viewed from the left side in the vehicle width direction. A plurality of first screw holes 22a into which fastening bolts 11 are screwed; a plurality of second screw holes 22b into which second fastening bolts 12 for fastening and fixing the transmission 3 are screwed; A plurality of through-holes 22c through which the second fastening bolts 12 that are screwed into screw holes (not shown) are inserted are formed in the vehicle width direction.

Note that the first fastening bolt 11 is inserted from the vehicle width direction left to the vehicle width direction right, and the second fastening bolt 12 screwed into the second screw hole 22b is inserted from the vehicle width direction left to the vehicle width direction right. It is assumed that the second fastening bolt 12 inserted through the through hole 22c is inserted from the vehicle width direction right to the vehicle width direction left.

More specifically, as shown in FIGS. 3 and 4, the front mating surface 221a has two first screw holes 22a into which the first fastening bolts 11 are screwed and one threaded hole through which the second fastening bolt 12 is inserted. A through hole 22c and three first screw holes 22a into which the first fastening bolts 11 are screwed are formed in this order from above the vehicle.

The through hole 22c of the front mating surface 221a described above has an inner diameter through which the second fastening bolt 12 can be inserted, and has a substantially cylindrical shape that fits into the chain cover 40 (third through hole 403 of the front mating surface 42a described later). A similar collar (reference numeral omitted) is inserted.

On the other hand, as shown in FIGS. 3 and 4, the rear mating surface 222a has one second screw hole 22b into which the second fastening bolt 12 is screwed and two first threaded holes into which the first fastening bolts 11 are screwed. A screw hole 22a, one through hole 22c through which the second fastening bolt 12 is inserted, and four first screw holes 22a into which the first fastening bolt 11 is screwed are formed in this order from above the vehicle. there is

Although not shown in detail, the cylinder head 23 of the engine body 20 includes an upper portion of the combustion chamber, an intake port serving as an inflow passage for air supplied to the combustion chamber, and an exhaust passage for exhaust gas generated in the combustion chamber. is formed.
Further, the cylinder head 23 includes an intake valve that opens and closes the intake port, an exhaust valve that opens and closes the exhaust port, an intake camshaft 30 (see FIG. 4) that opens and closes the intake valve, and an exhaust camshaft that opens and closes the exhaust valve. 31 (see FIG. 4) and the like are provided.
As shown in FIG. 4, the intake camshaft 30 and the exhaust camshaft 31 are shaft bodies having a rotation axis in the vehicle width direction, and are rotatably supported by the cylinder head 23 and the head cover 24. .

As shown in FIG. 4, the engine main body 20 includes a fuel pump chain 32 for transmitting the driving force of the crankshaft 21 to the fuel pump drive shaft 28, and a fuel pump drive shaft 28 for transmitting the crankshaft 21 through the fuel pump chain 32. A timing chain 33 that transmits the driving force to the intake camshaft 30 and the exhaust camshaft 31, and an oil pump chain 34 that transmits the driving force of the crankshaft 21 to the oil pump drive shaft 29 are arranged on the left side in the vehicle width direction. It is arranged between the front edge 221 and the rear edge 222 .

2 and 3, the chain cover 40 of the engine 2 is a substantially plate-like member interposed between the engine block 22 of the engine body 20 and the transmission 3. , the timing chain 33 and the oil pump chain 34 are mounted and fixed to the engine block 22 so as to integrally cover them.

The chain cover 40 is attached and fixed to the engine block 22 via a liquid sealing agent 13 (see FIG. 6) that seals the gap between the front mating surface 221a and the rear mating surface 222a of the engine block 22. there is

More specifically, as shown in FIGS. 3, 5, and 6, the chain cover 40 is spaced from the front edge 221 and the rear edge 222 of the engine block 22 by a predetermined distance in the vehicle width direction. a substantially plate-like cover body 41 facing across a front edge portion 42 in which the front edge of the cover body 41 protrudes rightward in the vehicle width direction so as to face the front edge portion 221 of the engine block 22; The rear edge of the cover body 41 is formed integrally with the rear edge 43 projecting rightward in the vehicle width direction so as to face the rear edge 222 of the block 22 .

As shown in FIGS. 3 and 5, the cover body 41 has a crank opening 41a through which the front end of the crankshaft 21 is inserted.
As shown in FIG. 5, the front edge portion 42 has a substantially flat surface facing the front mating surface 221a of the engine block 22 at its right end surface in the vehicle width direction. 22 is formed as a front mating surface 42a that abuts against the front mating surface 221a.

As shown in FIGS. 5 and 6, the rear edge portion 43 has a substantially flat surface facing the rear mating surface 222a of the engine block 22 at its right end surface in the vehicle width direction. It is formed as a rear mating surface 43 a that contacts the rear mating surface 222 a of the engine block 22 .
That is, as shown in FIG. 6, the chain cover 40 is formed in a substantially gate-shaped cross-section opening on the right side in the vehicle width direction in a horizontal cross section along the vehicle width direction.

Therefore, as shown in FIG. 7, when the chain cover 40 is fastened to the engine block 22, the chain cover 40 and the engine block 22 form an internal hollow space that is open in the vertical direction of the vehicle. The above-described fuel pump chain 32, timing chain 33, and oil pump chain 34 are arranged in this internal hollow space. Therefore, the chain cover 40 , together with the engine block 22 , forms an accommodation space S for accommodating the fuel pump chain 32 , the timing chain 33 , and the oil pump chain 34 when fastened and fixed to the engine block 22 .

Further, as shown in FIG. 5, the front mating surface 42a and the rear mating surface 43a of the chain cover 40 are screwed into the first screw holes 22a of the engine block 22 when viewed from the right side in the vehicle width direction. a plurality of first through holes 401 through which the first fastening bolts 11 are inserted; a plurality of second through holes 402 through which the second fastening bolts 12 screwed into the second screw holes 22b of the engine block 22; A plurality of third through-holes 403 through which the second fastening bolts 12 are threaded into threaded holes (not shown) provided in the machine 3 are formed to open in the vehicle width direction.

Therefore, the first through-hole 401 communicates with the first screw hole 22a of the engine block 22 to form an insertion hole through which the first fastening bolt 11 is inserted.
Further, as shown in FIG. 7(a), the second through hole 402 communicates with the second screw hole 22b of the engine block 22 to constitute the insertion hole 14 through which the second fastening bolt 12 is allowed to pass. there is The insertion hole 14 also communicates with a bolt opening hole 3a formed in the transmission 3 and through which the second fastening bolt 12 is inserted.

In addition, as shown in FIG. 7(b), the third through-hole 403 communicates with the through-hole 22c of the engine block 22 to form an insertion hole 15 through which the second fastening bolt 12 is inserted. . This insertion hole 15 also communicates with the screw hole 3 b of the transmission 3 .
More specifically, the front mating surface 42a of the chain cover 40 has, as shown in FIG. Three third through holes 403 and three first through holes 401 through which the first fastening bolts 11 are inserted are formed in this order from above the vehicle.

The third through hole 403 of the front mating surface 42a has an inner diameter through which the second fastening bolt 12 can be inserted, and has a substantially cylindrical collar (not shown) that fits into a screw hole (not shown) provided in the transmission 3. symbol omitted) is inserted.

On the other hand, the rear mating surface 43a of the chain cover 40 has, as shown in FIG. 1 through-hole 401, one third through-hole 403 through which second fastening bolt 12 is inserted, and four first through-holes 401 through which first fastening bolt 11 is inserted are opened in this order from above the vehicle. formed.

The first through hole 401, the second through hole 402, and the third through hole 403 of the chain cover 40 described above are, as shown in FIG. , along the edge of the front mating surface 42a on the accommodation space S side and the edge of the rear mating surface 43a on the accommodation space S side.

Further, as shown in FIG. 5, the liquid sealing agent 13 is applied to the front mating surface 42a and the rear mating surface 43a of the chain cover 40, so that the front mating surface 42a and the rear mating surface 43a of the engine block 22 face each other. and the gap with the rear mating surface 222a. The range where the liquid sealing agent 13 is applied on the front mating surface 42a and the rear mating surface 43a of the chain cover 40 will be described as a seal application area W. As shown in FIG.

Here, the liquid sealant 13 fills the gap between the front mating surface 221a of the engine block 22 and the front mating surface 42a of the chain cover 40, and the gap between the rear mating surface 222a of the engine block 22 and the rear mating surface 43a of the chain cover 40. A liquid sealant is used to close the gap. As shown in FIG. 6, the liquid sealing agent 13 is applied to the front mating surface 42a and the rear mating surface 43a of the chain cover 40 in the form of a substantially filament having a predetermined diameter.

As shown in FIGS. 5 and 8, the seal application area W of the chain cover 40 includes an area extending in the vertical direction of the vehicle along the edge of the front mating surface 42a of the chain cover 40 on the accommodation space S side, It is set to a range extending in the vertical direction of the vehicle along the edge of the rear mating surface 43a of the cover 40 on the accommodation space S side.

For example, in the vicinity of the second through hole 402 in the rear mating surface 43a of the chain cover 40, as shown in FIG. It is set in a substantially arc shape extending along the edge of the arc-shaped front mating surface 42 a on the accommodation space S side and the outer shape of the second through hole 402 in a side view.

In addition, in the vicinity of the third through hole 403 on the rear mating surface 43a of the chain cover 40, the seal application region W is substantially circular in side view when viewed from the right side in the vehicle width direction, as shown in FIG. 8(b). It is set in a substantially linear shape extending along the edge of the arc-shaped front mating surface 42a on the accommodation space S side.

As shown in FIGS. 5, 6 and 8, a first groove portion 404 and a first concave portion 405 are formed in the vicinity of the second through hole 402 on the rear mating surface 43a of the chain cover 40 as described above. In addition, a second groove portion 406 and a second recess portion 407 are provided in the vicinity of the third through hole 403 .

As shown in FIG. 7A, when the engine block 22 and the chain cover 40 are fastened and fixed, the first groove portion 404 is thinned toward the second through hole 402 by the rear mating surface 222a of the engine block 22. It is recessed to allow the flow of the spread liquid sealant 13 and to store the liquid sealant 13 that has flowed.

Specifically, as shown in FIGS. 5, 6, and 8A, the first groove portion 404 is set near the second through hole 402 in a side view from the right side in the vehicle width direction. Between the seal application region W, which is approximately semicircular in side view, and the second through hole 402, a concave groove is formed along the seal application region W, approximately semicircular in side view, with a predetermined groove width. .

As shown in FIG. 6, the first groove portion 404 has a cross-sectional shape that is larger than the cross-sectional area of the liquid sealant 13 applied to the seal application region W in the cross section along the radial direction of the second through hole 402 . The area is recessed in a substantially U-shaped cross section.
In addition, as shown in FIG. 8A, one end of the first groove portion 404 on the lower side of the vehicle is positioned adjacent to the second through hole 402 on the lower side of the vehicle in a side view viewed from the right side in the vehicle width direction. It extends to a position near the 1 through hole 401 .

In addition, the first recess 405 is provided as a flow space for the air in the first groove 404 pushed out by the inflow of the liquid sealant 13, and is recessed in a concave shape that is continuous with one end of the first groove 404 on the vehicle lower side. . As shown in FIGS. 5, 6, and 8A, the first recessed portion 405 is formed in a portion of the rear mating surface 43a below the first through hole 401 and has a volume larger than that of the first groove portion 404. It is recessed with a large volume.

Specifically, as shown in FIGS. 5, 6, and 8A, the first recess 405 is wider than the groove width of the first groove 404 when viewed from the right side in the vehicle width direction. Approximately rectangular in side view having a length in the vehicle width direction and a length in the vertical direction of the vehicle that is approximately the same as the length in the vehicle width direction, and is slightly deeper than the groove depth of the first groove portion 404 . recessed.

Further, as shown in FIG. 7B, when the engine block 22 and the chain cover 40 are fastened and fixed, the second groove portion 406 is directed toward the third through hole 403 by the rear mating surface 222a of the engine block 22. It is recessed so as to allow the inflow of the liquid sealing agent 13 that has been thinly pushed out and to store the inflowing liquid sealing agent 13 .

Specifically, as shown in FIG. 8B, the second groove portion 406 has a substantially linear seal application area W set near the third through hole 403 in a side view viewed from the right side in the vehicle width direction. and the third through-hole 403 is formed to have a predetermined groove width along the seal application region W and have a generally straight groove shape in a side view.

As with the first groove portion 404, the second groove portion 406 has a cross-sectional shape in a cross section along the radial direction of the third through hole 403 that is larger than the cross-sectional area of the liquid sealant 13 applied to the seal application region W. The cross-sectional area is recessed in a substantially U-shaped cross section.
As shown in FIG. 8B, the second groove portion 406 has a groove length longer than the diameter of the third through-hole 403 (substantially the length in the vertical direction of the vehicle) when viewed from the right side in the vehicle width direction. ) is extended.

In addition, the second recess 407 is provided as a flow space for the air in the second groove 406 pushed out by the inflow of the liquid sealing agent 13, and is recessed in a concave shape that is continuous with one end of the second groove 406 on the upper side of the vehicle. . As shown in FIG. 8(b), the second recess 407 is recessed in a portion of the rear mating surface 43a above the third through hole 403 in the vehicle and has a volume larger than that of the second groove 406. there is

Specifically, as shown in FIG. 8B, the second recessed portion 407 has a length substantially wider than the groove width of the second groove portion 406 in a side view viewed from the right side in the vehicle width direction. , and has substantially the same length in the vertical direction of the vehicle as the second groove portion 406 , and is substantially rectangular in side view, and is recessed to a depth slightly deeper than the groove depth of the second groove portion 406 .

As described above, it corresponds to the engine body 20 having the mating surfaces (the front mating surface 221a and the rear mating surface 222a) at one end in the vehicle width direction and the mating surfaces (the front mating surface 221a and the rear mating surface 222a) of the engine body 20. The chain cover 40 has mating surfaces (front mating surface 42a, rear mating surface 43a) and is fastened and fixed to the engine body 20 to form the accommodation space S, and the mating surfaces of the engine body 20 (front mating surface 221a, rear mating surface 43a). The sealing structure of the engine 2 including the mating surfaces 222a) and the liquid sealant 13 interposed between the mating surfaces (the front mating surfaces 42a and the rear mating surfaces 43a) of the chain cover 40 is such that the engine 2 is connected to the engine body 20 and the rear matching surface 43a of the chain cover 40 in the vehicle width direction, and are provided with insertion holes 14 and 15 through which the second fastening bolts 12 are inserted. A portion along the edge of the housing space S is used as a seal application area W where the liquid sealant 13 is applied, and the rear mating surface 43a of the chain cover 40 is positioned between the insertion holes 14 and 15 and the seal application area W. In the portion corresponding to , grooves (first groove 404, second groove 406) recessed in a substantially groove shape extending along the edge of the accommodation space S side are provided, so that the seal application area W is extended from the insertion hole Recessed grooves (first groove 404, second groove 406) can be provided on the path of the mating surfaces towards 14,15.

For this reason, for example, when the liquid sealant 13 applied to the seal application region W on one of the mating surfaces is spread thinly by pressure from the other mating surface, the sealing structure of the engine 2 is not affected by the insertion holes 14 and 14 . 15, the liquid sealing agent 13 can flow into the grooves (first groove 404, second groove 406).

As a result, the seal structure of the engine 2 controls the flow of the liquid sealant 13 accompanying fastening and fixing between the engine body 20 and the chain cover 40, and prevents the liquid sealant 13 from flowing into the insertion holes 14 and 15. be able to. In other words, the sealing structure of the engine 2 can prevent the liquid sealing agent 13 from interfering with the insertion of the second fastening bolt 12 into the insertion holes 14 and 15 .

Therefore, even if the second fastening bolt 12 is inserted through the insertion holes 14 and 15 in a process after the engine main body 20 and the chain cover 40 are fastened and fixed, the seal structure of the engine 2 can be The insertion of the second fastening bolt 12 into 14, 15 can be facilitated.

Further, the rear matching surface 43a of the chain cover 40 is recessed so as to be adjacent to the grooves (first groove 404, second groove 406) and to be continuous with the grooves (first groove 404, second groove 406). A concave portion (first concave portion 405, second concave portion 407) is provided, and the concave portion (first concave portion 405, second concave portion 407) has a larger volume than the groove portion (first groove portion 404, second groove portion 406). As a result, the seal structure of the engine 2 can improve the sealing performance between the rear mating surface 222a of the engine body 20 and the rear mating surface 43a of the chain cover 40, and the liquid sealant to the insertion holes 14 and 15 can be improved. 13 can be reliably blocked.

Specifically, when the liquid sealing agent 13 starts flowing into the grooves (the first groove 404 and the second groove 406), the air in the grooves (the first groove 404 and the second groove 406) is caused by the flowing liquid sealing agent 13. Compressed. For this reason, the volume of the groove (first groove 404, second groove 406) is smaller, that is, the groove (first groove 404, second groove 406) with a smaller air compression allowance up to the compression limit, the liquid sealing agent 13 not only does not smoothly flow into the grooves (first groove 404, second groove 406), but also the compressed air in the grooves (first groove 404, second groove 406) causes liquid sealant 13 to flow into the groove (first groove 406). 404 and second groove 406).

Therefore, the recesses (first recess 405, second recess 407) having a larger volume than the grooves (first recess 404, second recess 406) are replaced with the grooves (first recess 404, second recess 406). , the seal structure of the engine 2 is such that the liquid sealant 13 pushes the air in the grooves (first groove 404, second groove 406) into the recesses (first recess 405, second recess 407). Therefore, it is possible to increase the amount of air compression up to the compression limit compared to the case where the recesses (the first recesses 405 and the second recesses 407) are not provided.

As a result, the sealing structure of the engine 2 is such that the liquid sealing agent 13 flowing into the grooves (first groove 404, second groove 406) is compressed by air in the grooves (first groove 404, second groove 406). It is possible to prevent the liquid sealing agent 13 from being pushed out of (the first groove portion 404 and the second groove portion 406) and to smoothly flow the liquid sealing agent 13 into the groove portions (the first groove portion 404 and the second groove portion 406).

Furthermore, since the pressing of the liquid sealant 13 by the air in the compressed grooves (first groove 404 and second groove 406) is suppressed, the sealing structure of the engine 2 is such that the rear mating surface 222a of the engine body 20 and the chain cover 40 The liquid sealant 13 can be smoothly flowed between the rear mating surfaces 43a and spread more uniformly and thinly.

Therefore, the sealing structure of the engine 2 can improve the sealing performance between the rear mating surface 222a of the engine body 20 and the rear mating surface 43a of the chain cover 40, and the flow of the liquid sealant 13 into the insertion holes 14 and 15 is prevented. can be reliably prevented.

In addition, in cross sections along the radial direction of the insertion holes 14 and 15, the grooves (the first grooves 404 and the second grooves 406) are larger than the cross-sectional area of the liquid sealant 13 applied to the mating surfaces. Due to the recessed area, the seal structure of the engine 2 allows the liquid sealing agent 13 that has started to flow into the grooves (first groove 404, second groove 406) to flow into the grooves (first groove 404, second groove 406). Since it can be reliably stored, it is possible to prevent the liquid sealing agent 13 from flowing out of the grooves (the first groove 404 and the second groove 406).

Therefore, the sealing structure of the engine 2 can more reliably prevent the liquid sealing agent 13 from flowing into the insertion holes 14 and 15 .
Therefore, the seal structure of the engine 2 can more reliably facilitate the insertion of the second fastening bolt 12 into the insertion holes 14 and 15 .

Further, as a configuration in which the transmission 3 is attached to the engine body 20 with the chain cover 40 interposed therebetween, the insertion hole 14 communicates with the bolt opening 3a of the transmission 3 through which the second fastening bolt 12 can be inserted. 15 communicates with the screw hole 3b of the transmission 3 through which the second fastening bolt 12 can be inserted. and the opening in which the insertion hole 15 of the engine 2 communicates with the screw hole 3b of the transmission 3, the insertion of the second fastening bolt 12 is liquid-sealed. Inhibition by the agent 13 can be prevented.

Therefore, the seal structure of the engine 2 is, for example, the case where the transmission 3 is attached to the engine 2 via the second fastening bolt 12 after the engine body 20 and the chain cover 40 are fastened and fixed. However, the insertion of the second fastening bolt 12 can be facilitated.

Further, since the second fastening bolts 12 for fastening and fixing the transmission 3 to the engine 2 are inserted through the insertion holes 14 and 15 , the sealing structure of the engine 2 can be It is possible to prevent the liquid sealing agent 13 from interfering with the insertion of the second fastening bolt 12 and to prevent the liquid sealing agent 13 from adhering to the threads of the second fastening bolt 12 . Therefore, the seal structure of the engine 2 can stabilize the engagement state between the engine 2 and the transmission 3 .

In correspondence with the configuration of this invention and the above-described embodiments,
One end in the predetermined direction of the present invention corresponds to the left side in the vehicle width direction of the embodiment,
and so on,
The mating surfaces of the engine body correspond to the front mating surface 221a and the rear mating surface 222a of the engine body 20,
The mating surfaces of the cover member correspond to the front mating surface 42a and the rear mating surface 43a of the chain cover 40,
The internal hollow space corresponds to the accommodation space S,
The cover member corresponds to the chain cover 40,
The insertion member and the fastening member correspond to the second fastening bolt 12,
The groove corresponds to the first groove 404 and the second groove 406,
The recess corresponds to the first recess 405 and the second recess 407,
The opening holes of the transmission correspond to the bolt opening holes 3a and the screw holes 3b of the transmission 3,
The fastened parts correspond to the transmission 3,
The present invention is not limited to the configurations of the above-described embodiments, and many embodiments can be obtained.

For example, in the above-described embodiment, the sealing structure of the engine 2 was explained using the transverse engine 2. However, the present invention is not limited to this. There may be.
In addition, although the chain cover 40 is used as the cover member that is fastened and fixed to the engine body 20 to form the internal hollow space, the chain cover 40 is not limited to this, and is attached to the engine body 20 with a liquid sealant interposed. Any suitable configuration may be adopted as long as it is a cover member that For example, it may be a cover member attached to the front surface or the rear surface of the engine body 20 that is placed horizontally.

Further, although the insertion holes 14 and 15 through which the second fastening bolts 12 for fastening and fixing the transmission 3 are inserted, the insertion holes are not limited to this, and may be insertion holes through which positioning members such as knock pins are inserted. good.
Further, the first groove portion 404 and the first recess portion 405 are formed near the second through hole 402, and the second groove portion 406 and the second recess portion 407 are formed near the third through hole 403. The opening provided in the chain cover 40 communicates with the opening provided in the chain cover 40, and grooves and recesses may be formed at appropriate positions as long as it is near the opening through which an insertion member such as a fastening bolt is inserted. .

Further, although the first groove portion 404 and the first recess portion 405, and the second groove portion 406 and the second recess portion 407 are formed in the rear mating surface 43a of the chain cover 40, the present invention is not limited to this. It may be formed in the vicinity of the first through hole 401 and the third through hole 403 of the mating surface 42a.

Further, although the first groove portion 404 and the first recess portion 405, and the second groove portion 406 and the second recess portion 407 are formed in the rear mating surface 43a of the chain cover 40, the present invention is not limited to this. A first groove, a first recess, a second groove, and a second recess may be formed in the mating surface 222a.

Furthermore, in a state where the chain cover 40 is fastened and fixed to the engine body 20, if the first recess and the second recess communicate with the first groove 404 and the second groove 406 respectively, the recesses are formed at appropriate positions. You may
For example, in a state in which the first groove portion 404 and the second groove portion 406 are formed in the rear mating surface 43a of the chain cover 40, and the chain cover 40 is fastened and fixed to the engine body 20 in the rear mating surface 222a of the engine body 20, A first recess and a second recess may be provided so as to face one end of the first groove portion 404 and one end of the second groove portion 406 .

Alternatively, a first groove portion and a second groove portion are formed in the vicinity of the second screw hole 22b and the through hole 22c, respectively, in the rear mating surface 222a of the engine body 20, and the chain cover 40 has a rear mating surface 43a. The first recess and the second recess may be recessed so as to face one end of the first groove and one end of the second groove when the chain cover 40 is fastened and fixed.

In addition, although the first groove portion 404 and the second groove portion 406 are recessed to have a substantially U-shaped cross section, the present invention is not limited to this. As long as there is a volume that allows for this, the groove may have an appropriate cross-sectional shape such as a groove having a substantially V-shaped cross section or a groove having a substantially rectangular cross-section.
In addition, although the first recess 405 and the second recess 407 are substantially rectangular in side view, the present invention is not limited to this. As long as the volume is larger than the volume of the groove, the recess may be recessed in an appropriate shape. .

Also, in the rear mating surface 43 a of the chain cover 40 , the first groove 404 and the first recess 405 are formed near the second through hole 402 , and the second groove 206 and the second recess 207 are formed near the third through hole 403 . However, it is not limited to this, and may be formed in the vicinity of the first through hole 401, for example.

Further, although the liquid sealing agent 13 is applied to the seal application region W of the front mating surface 42a and the rear mating surface 43a of the chain cover 40, the configuration is not limited to this, and the front mating surface 221a of the engine body 20, The liquid sealing agent 13 may be applied to the seal application region along the edge of the rear mating surface 222a on the accommodation space S side. At this time, the first groove 404 and the first recess 405 , and the second groove 406 and the second recess 407 may be formed in the chain cover 40 .

2 Engine 3 Transmission 3a Bolt opening 3b Threaded hole 12 Second fastening bolt 13 Liquid sealant 14 Insertion hole 15 Insertion hole 20 Engine body 40 Chain cover 42a Front mating surface 43a Rear mating surface 221a Front mating surface 222a Rear mating surface 404 First groove 405 First recess 406 Second groove 407 Second recess S Accommodating space W Seal coating area

Claims (5)

an engine body having a mating surface at one end in a predetermined direction;
a cover member having a mating surface corresponding to the mating surface of the engine body and fastened and fixed to the engine body to form an internal hollow space;
A seal structure for an engine comprising the mating surface of the engine body and a liquid sealant interposed between the mating surfaces of the cover member,
The engine is
a plurality of insertion holes passing through the mating surface of the engine body and the mating surface of the cover member in a predetermined direction and through which insertion members are inserted;
A sealing application area to which the liquid sealing agent is applied is provided in a portion along the edge of the inner hollow space side of the mating surface of the engine body or the mating surface of the cover member ,
the plurality of insertion holes,
As the first insertion hole and the second insertion hole provided along the seal application area,
In the first insertion hole,
A fastening member for fastening and fixing the cover member to the engine body is inserted as the insertion member,
The second insertion hole is
communicating with an opening hole of a fastened part fixed to the engine body with the cover member interposed therebetween;
On the mating surface of the cover member,
a groove recessed in a substantially groove-like shape extending along the edge on the side of the internal hollow space in a portion corresponding to between the second insertion hole and the seal application region ;
a recess that is recessed with a volume larger than the volume of the groove and that is continuous with one end of the groove ;
The recess is
provided between the first through-hole and the second through-hole adjacent along the seal application region
Engine seal structure. an engine body having a mating surface at one end in a predetermined direction;
a cover member having a mating surface corresponding to the mating surface of the engine body and fastened and fixed to the engine body to form an internal hollow space;
A seal structure for an engine comprising the mating surface of the engine body and a liquid sealant interposed between the mating surfaces of the cover member,
The engine is
a plurality of insertion holes passing through the mating surface of the engine body and the mating surface of the cover member in a predetermined direction and through which insertion members are inserted;
A sealing application area to which the liquid sealing agent is applied is provided in a portion along the edge of the inner hollow space side of the mating surface of the engine body or the mating surface of the cover member,
the plurality of insertion holes,
As the first insertion hole and the second insertion hole provided along the seal application area,
In the first insertion hole,
A fastening member for fastening and fixing the cover member to the engine body is inserted as the insertion member,
The second insertion hole is
communicating with an opening hole of a fastened part fixed to the engine body with the cover member interposed therebetween;
On the mating surface of the cover member,
a groove recessed in a substantially groove-like shape extending along the edge on the side of the internal hollow space in a portion corresponding to between the second insertion hole and the seal application area;
a recess that is recessed with a volume larger than the volume of the groove and that is continuous with one end of the groove;
The recess is
provided at a position adjacent to the second insertion hole across the first insertion hole adjacent to the second insertion hole along the seal application region
Engine seal structure. The groove is
From between the second insertion hole and the seal application area, the first insertion hole and the second seal application area are positioned so that the first insertion hole is located in a portion corresponding to the seal application area. continuous with the recess through the insertion hole of
The seal structure for an engine according to claim 2. In a cross section along the radial direction of the second insertion hole, the groove is
4. The engine seal structure according to any one of claims 1 to 3, wherein the recess has a larger cross-sectional area than the cross-sectional area of the liquid sealant applied to the mating surfaces. As a transmission that is attached to the engine body with the cover member interposed therebetween,
The second insertion hole is
5. The engine seal structure according to any one of claims 1 to 4, wherein the seal structure communicates with an opening hole of the transmission through which the insertion member can be inserted .

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